Concrete-mixer.



no. 663,999. Patented Dec. I8, 1900. I

- s. P.- McKELVEY.

CONCRETE MIXER.

(Application filed Aug, 7, 1899..

(No Model.)

2 SheetsSheet, 1

No. 663,999. Patented Dec. 18, I900,

s. P. McKELVEY. CONCRETE MIXER. (Application med 'Au 7, 1899.)

2 Sheets-Sheet 2.

(No Model.)

rm: NORRIS PETERS cu. PNOYQ-l :1 Q0 WASHINDTON. 0 c4 UNITED STATES PATENT OFFICE.

SAMUEL P. MOKELVEY, OF CHICAGO, ILLINOIS, ASSIGNOR OF ONE-HALF TO 0. G. HURSON, OF SAME PLACE.

CONCRETE-MIXER.

SPECIFICATION forming part of Letters Patent No. 663,999, dated December 18, 1900. Application filed August '7, 1899. Serial No- 726A87- (N model.)

T 0 a whom i m y c end of the drum or slightly rearward of the Be it known that I, SAMUEL P. MOKELVEY, feed-aperture a. This drum may be conical a citizen of the United States, residing at Ohiin form, but that is not essential. Its inner cago, county of Cook, and State of Illinois, end f is closed, and it is mounted rigidly on 5 haveinvented a new and useful Improvement legs 9 in the drum a and partakes of its moin Concrete-Mixers, of which the followingis tion. A space sufficient is maintained bea specification. tween the inner and outer drums to permit My invention relates to that class of conthe contents of the inner drum to drop from crete-mixers in which a rotatable drum is utilits open mouth f into the body of the outer IO ized as a mixer and is provided with a sepadrum. Series of projecting wings or deflectrate compartment in which to receive the maors, set at an angle, are rigidly attached to terial forming the concrete, mix it in its dry the inner surface of both the inner and outer state, and automatically discharge it intoandrums. On the inner drum f the deflectors other compartment in which water is introh are placed with the lower. point of deflec- 15 duced and the mixing continued until distion toward its mouth f to deflect its concharged by the machine. tents toward the feed and discharge it into The object desired is to keep the mass movthe forward end of the outer drum 0.. In the ing during the process of mixing from the outer drum to the wings or deflectors have the moment it enters the machine until it is dislower point of deflection toward the outlet 20 charged to mix it thoroughly in its dry state a in order that its contents may be carried and in the wet, each in its own compartment. rearward to the outlet.

The device is illustrated in the accom pany- The dry materialcrushed stone, sand, and ing drawings, in which cement.is shoveled through the feed-aper- Figure 1 is a side elevation of the drum, ture into the innerdrumfand thrown against 2 showing it mounted on a truck. Fig. 2 is an the closed inner end f. The drums are reelevation of the front or feed end of the drum. volved usuallyin one direction only. The dry Fig. 3 is a longitudinal section on line 3 3, material is carried up on the side of the inner Fig. 1. Fig. elis a plan view of spider and drum, rolls back over itself, is caught up by crank by which the drum is revolved. Fig. one deflector after another and moved foro 5 is a longitudinal section, being a modified ward and discharged at its mouth) into the form of Fig. 3. Fig. 6 is a cross-section on forward end of the outer drum, where a spray line 6 6, Fig. 5. Fig. 7 is a cross-section on dis provided, to which ahose may be attached line 7 '7, Fig. 3. and the water introduced into the bottom of Similarletters refer to similar parts throughthe outer drum. As the dry mixed concrete 5 out the several views. drops from the inner drum it is carried up the A drum or is mounted horizontally upon a side of the outer drum, falls back, rolls over truck 1), preferably of two wheels when iuon itself, and is caught by one wing or deflector tended to be operated by hand and of four after another and moved forward until it is wheels when operated by steam or other 1110- discharged at the outlet a 'By this method 4o tor. The drum (1 is provided with the steel the concrete dropping from varied heights in tracks 0 c encircling the drum, which engage its passage through the drum all the lumps the flanged wheels at d d d, (two on each side are broken up, the particles of stone and sand of the drum,) mounted on a shaft m in bearare coated with the moist cement, and the ings on the truck I). The'wheels d are prostone cement and sand thoroughly blended 5 5 vided with ball-bearings to reduce friction and evenly mixed together without clogging and enable the operator to easily rotate the the machine. drum by means of the crank 6, attached to a The number of the deflectors may in a measspider Z, projecting from the rear end of the ure depend upon the rapidity it is desired to drum. The drum (1 is open-ended. a is the pass the concrete through the mixer. The I00 50 feeding end, and a the discharge or outlet. greater the number the more rapid is the v- A smaller drum f is inserted into the feed movement. While I arrange the deflectors so that usually the lower point of one is in line with the higher point of the next in advance, they may be placed indiscriminately through the drum without regard to order. It is not essential that any special order is observed.

Having thus described my invention what I claim as new, and desire to protect by Letters Patent, is-

1. In a concrete-mixer, an outer and an inner drum, the outer having open ends, the inner drum open at one end, short wings set at an angle projecting from the inner surface of each drum, the wings in the inner drum having their lower points of deflection toward the feed end of the drum, the wings in the outer drum having their lower points of deflection toward the outlet, means for rotating said drums as specified.

2. In a concrete-inixera rotatable d rum having open ends mounted horizontally on a truck, a shorter inner drum mounted rigidly on legs attached to the inner sides of said open-ended drum and having the same axial plane, an open mouth in said inner drum in line with the feed end of the drum, series of projecting wings set at an angle against the inner surface of said drums the angle of deflection in the inner drum being toward the feed-aperture, and the angle of deflection of the wings in the outer drum toward its outlet, means for rotating said drums as specified.

3. In a concrete-mixer, a rotatable drum mounted on wheels, a dry and a wet mixingcompartment in said drum, said dry mixingcompartinent consisting of a shorter inner I. In a concrete-mixer the combination of a truck provided with shafts carrying flanged wheels, with a horizontal drum having open ends, provided with steel tracks encircling its perimeter mounted on said flanged wheels, a spider on one end of said drum, a crankhandle to said spider, an inner drum mounted firmly on legs in said open-ended drum and partaking its motion, said inner drum being on the same axial plane as the open-ended drum and open toward the feed end of said outer drum, short projecting wings in said drums set at an angle, the wings of the inner drum adapted to deflect the contents toward its mouth and discharge into the feed end of the open-ended drum, the wings in said openended drum adapted to deflect the contents toward the outlet as the drum revolves, means for introducing water into saidopen-ended drum and means for rotating said drum.

SAMUEL P. MCKELVEY. In presence of H. C. HUNSBERGER, WILLIAM SEAFERT. 

